Thermal Leptogenesis in the Babu-Nandi-Tavartkiladze Model of Neutrino Mass
Abstract
We investigate neutrino mass and thermal leptogenesis in the Babu-Nandi-Tavartkiladze (BNT) model featuring a scalar quadruplet (Φ) and a pair of vector-like fermion triplets (Σ). In this framework, neutrino masses are generated via an effective dimension-7 operator LLHH(H†H)/Λ3 at the tree level and via the dimension-5 operator LLHH/Λ at the one-loop level. It naturally accommodates sub-eV neutrino masses even if the new physics scale Λ is 𝒪(TeV), thus making the model a compelling target for experimental searches. We explore the viability of thermal leptogenesis in this model, which is distinct from the canonical seesaw-based leptogenesis due to the presence of vector-like fermions. We find that leptogenesis is viable for MΣ≳ 107 GeV for a hierarchical spectrum of fermion triplets. However, in the quasi-degenerate regime, resonant enhancement of the CP asymmetry lowers this scale down to 𝒪(TeV), reconciling successful leptogenesis with the originally motivated TeV-scale phenomenology and testability of the model at colliders.
Versions
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BibTeX
@misc{dev2026thermal,
title = {{Thermal Leptogenesis in the Babu-Nandi-Tavartkiladze Model of Neutrino Mass}},
author = {P. S. Bhupal Dev and Srubabati Goswami and Debashis Pachhar and Drona Vatsyayan},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2608.01890},
eprint = {2608.01890},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2608.01890},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Thermal Leptogenesis in the Babu-Nandi-Tavartkiladze Model of Neutrino Mass
AU - P. S. Bhupal Dev
AU - Srubabati Goswami
AU - Debashis Pachhar
AU - Drona Vatsyayan
PY - 2026
DA - 2026/10/14
PB - arXiv
DO - 10.48550/arxiv.2608.01890
UR - https://arxiv.org/abs/2608.01890
AB - We investigate neutrino mass and thermal leptogenesis in the Babu-Nandi-Tavartkiladze (BNT) model featuring a scalar quadruplet (Φ) and a pair of vector-like fermion triplets (Σ). In this framework, neutrino masses are generated via an effective dimension-7 operator LLHH(H^†H)/Λ^3 at the tree level and via the dimension-5 operator LLHH/Λ at the one-loop level. It naturally accommodates sub-eV neutrino masses even if the new physics scale Λ is 𝒪(TeV), thus making the model a compelling target for experimental searches. We explore the viability of thermal leptogenesis in this model, which is distinct from the canonical seesaw-based leptogenesis due to the presence of vector-like fermions. We find that leptogenesis is viable for M_Σ≳ 10^7 GeV for a hierarchical spectrum of fermion triplets. However, in the quasi-degenerate regime, resonant enhancement of the CP asymmetry lowers this scale down to 𝒪(TeV), reconciling successful leptogenesis with the originally motivated TeV-scale phenomenology and testability of the model at colliders.
ER -